Improvement in the manufacture of augers



W. TUCKER. Manufacture of Angers.

Patented Oct. 1, I878.

. UNITED STATES PATENT QFFICE.

WILLIAM TUCKER, OF EAST BROOKFIELD, MASSACHUSETTS.

IMPROVEMENT IN THE MANUFACTURE OF AUGERS.

Specification forming part of Letters Patent No. 208,651, dated October1, 1878; application filed March 4, 1878.

To all whom it may concern Be it known that I, WILLIAM TUCKER, of EastBrookfield, in the county of WVorcester, Massachusetts, have invented anew and useful Improvement in the Art of Manufacturing Angers, of whichthe following is a full, clear, and exact description.

This invention relates to the manufacture of twist-angers or anger-bits;the object of the improvement being to produce tools of the very finestcutting qualities cheaper than those made of one kind of steel, ofgreatly inferior quality.

My said invention consists in a peculiar method or process of producingangers or bits possessing the said advantage, as hereinafter set forth.

Figure 1 of the accompanying drawing is a sectional perspective view ofa large piece of steel illustrating this invention. Figs. 2 and 3 aresectional perspective views of thin bars or plates of the same material.Figs. 4 and 5 are perspective elevations, on alarger scale, of twobit-blanks cut from the latter; and

.Figs. 6 and 7 are elevations of different styles of auger-bits madefrom the respective blanks.

Like letters of reference indicate correspondin g parts in the severalfigures.

In carrying out my present invention I weld or unite in large masses twoqualities of steel, a I), one of them, a, of a cheap grade that will notharden, and, of course, would not alone make a cutting-edge. This formsthe great bulk of the product. The other, b, is giltedge, or the fineststeel, of which only enough is used to form the cutting parts of thetools for which the steel is intended, and this is so disposed in theingot or lump as to lie uniformly along one edge of a bar. producedtherefrom, as illustrated in Fig. 1. The heavy bar of variableproportions (represented by Fig. 1) is next reduced by rolling to a thinflat bar or plate, such as represented by Fig. 2 or 3, of the properdimensions in crosssection for the length and thickness of blanks forany given style and size of angers or bits. The thin bars or plates arenext cut transversely into blanks, Figs. 4 and 5, of the proper width,as illustrated by dotted'lines c 0 Figs. 2 and 3, and these blanks, intheir turn, are converted by any known or approved process into angersor auger-bits-such, for example, as are represented by Figs. 6 and 7.

Fig. 6 represents one of my peculiar alltwist bits, patented December29, 1874, and the thin plate rep resented by Fig. 2 is adapted tofurnish proper stock for a blank, Fig. 4, suitable to be twisted intothis style of bit.

Fig. 7 represents an ordinar T bit, the blank of which is swaged to formthe head and shank and reduce the blade before the latter is twisted.Fig. 5 represents a suitable blank for such a bit, and Fig. 3 stock fromwhich such blanks may be cut.

The flat bars or plates will preferably be made at steel-works and soldto the trade, to be cut up into blanks by auger-manufacturers.

The repeated rollings of the metal completely unites the two qualitiesof steel, so as to absolutely preclude any separation at the weld.

The relative proportions of the two grades of steel and their relativefineness are not fixed, but must depend somewhat on circumstances.

I am aware that compound rolled bars of iron and steel have been made ofvarious proportions and shapes, and for various purposes. Such barscould not, however, be cut transversely into blanks for angers or bits,for the reason that the grain or fiber of the iron, which lieslongitudinally in the bar, would thus be rendered transverse in the bit,and this would not do, as it would not give the requisite stiffness tothe tool, and, moreover, the grain of iron, running across the blank,would tear in twistin Steel, on the contrary, can be made up either wayof the bar without difl'erencc in the result.

The structural peculiarity of steel, unaffected by rolling, renders itthus essentially difl'erent from any quality of rolled iron for thepurposes of this invention. The combination of difterent grades of ironand of iron and steel is, therefore, disclaimed as old, and as incapableof use for the purposes of this invention.

The following is what I claim as new and of my own invention, and desireto secure by Letters Patent, namely:

The method of making angers or auger-hits and forming the cuts by anyapproved appaherein specified, consisting in welding toratns, the saidcuts being formed from the gether two qualities of steel in largemasses, said finer steel. reducing the metal to thin bars or plates ofproper proportions in cross-section, with the VILLIAM fine-r steel atone edge, cutting these bars or Witnesses: plates transversely intoblanks of proper SAMUEL I).UoL1-:, width, and snhseqnentlv twisting theblanks '1. It. llIE'lTElLAtE.

